/*
 * To change this license header, choose License Headers in Project Properties.
 * To change this template file, choose Tools | Templates
 * and open the template in the editor.
 */
package action;

import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import javax.servlet.ServletContext;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author sally
 */
@WebServlet(name = "LifeServlet", urlPatterns = {"/LifeServlet","/A/*","*.java"})
public class LifeServlet extends HttpServlet {

    int count = 0;
    String path = " ";
    private InputStream fin;

    /**
     * Processes requests for both HTTP <code>GET</code> and <code>POST</code>
     * methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
	    throws ServletException, IOException {
	response.setContentType("text/html;charset=UTF-8");
	PrintWriter out = response.getWriter();
	    /* TODO output your page here. You may use following sample code. */
	    
	    out.println("訪客次數:" + ++count+"<br>");

	    
	    
	 
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
	    throws ServletException, IOException {
	processRequest(request, response);
    }

    /**
     * Handles the HTTP <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
	    throws ServletException, IOException {
	processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
	return "Short description";
    }// </editor-fold>

    @Override
    public void init() throws ServletException {
	super.init(); //To change body of generated methods, choose Tools | Templates.
	System.out.println("#####   init   #####");
	ServletContext sc = this.getServletContext();
	path = sc.getRealPath("/count.txt");
	System.out.println(path);
	java.io.File file = new java.io.File(path);
	System.out.println(file.exists());
	if (file.exists()) ;
	{
	    try (java.io.FileInputStream fin = new java.io.FileInputStream(file);
		    java.io.DataInputStream din = new java.io.DataInputStream(fin);) {
		count = din.readInt();

	    } catch (Exception e) {
		e.printStackTrace();
	    }
	}

    }

    @Override
    public void destroy() {
	super.destroy(); //To change body of generated methods, choose Tools | Templates.
	System.out.println("=====程式結束destroy========");
	try (java.io.FileOutputStream fout
		= new java.io.FileOutputStream(path);
		java.io.DataOutputStream dout
		= new java.io.DataOutputStream(fout);) {
	    dout.writeInt(count);

	} catch (Exception e) {
	    e.printStackTrace();
	}

    }

}
